竖直振动激励下颗粒块的能量耗散  

Energy dissipation of granular block under vertical vibration

作　　者：王影[1] 孔维姝[1] 胡林[1] 史彤阳 赵闯[1] 

机构地区：[1]贵州大学理学院贵州光电子技术与应用重点实验室,贵州贵阳550025

出　　处：《山东大学学报（理学版）》2015年第5期30-34,共5页Journal of Shandong University(Natural Science)

基　　金：贵州省科技厅基金资助项目(黔科合J字[2011]2099号;黔科合J字[2012]2166号);贵州省省长专项基金资助项目(黔省专合字(2010)5号);国家自然科学基金资助项目(11264006)

摘　　要：通过实验对垂直振动激励下颗粒块的内耗进行了研究,测量了在不同激振强度下4种颗粒块的平均飞行时间。对实验结果进行了动力学分析,建立了竖直振动激励下颗粒块平均飞行时间与激振强度和内耗因子的定量关系,并用此关系对实验数据进行了拟合,拟合结果与实验结果吻合较好。对实验结果进行的理论分析表明,在相同激振强度下,内部结构不同的颗粒块的内耗与颗粒块内部颗粒尺寸、颗粒间介质的黏性以及外界的激振频率有关,其内耗特征是以颗粒间相互碰撞所耗散的能量为主。The internal energy dissipation of the granular block under the vertical vibrating was studied through the experiment.The average flight time of four granular blocks for different vibrating strength was measured.Dynamic analysis of the experimental results was carried out.The quantitative relationship of the average flight time and the vibrating strength and the internal friction factor was used to fit the relationship for fitting the experimental data,the fitting results are well agreed with the experimental results.Theoretical analysis of the experimental results show that the internal energy dissipation of different internal structure depends on the particle size,particle viscidity and vibrating fre-quency for a given vibrating strength.The internal energy dissipation character is mainly the collision dissipation of each other.

关 键 词：颗粒物质 平均飞行时间 内耗 碰撞 

分 类 号：O469[理学—凝聚态物理]